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Written by RepairPal Car Genius

Updated

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2013 Lexus GS350 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2013 Lexus GS350 and How to Restore Smooth Performance

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Reviewed by

Andrew Hajjar

Written by RepairPal Car Genius

Updated January 14, 2025

21% chance it's the

Spark Plugs

15% chance it's the

Ignition Coil

64% chance it's

Something else

The most common reasons a 2013 Lexus GS350 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.

Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.

What are the best Lexus repair shops?

RepairPal Certified shops can diagnose and repair your 2013 Lexus GS350 engine and performance issues. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

How much does it cost to fix a 2013 Lexus GS350 has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Here are a few common symptoms of worn-out brake pads:

Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the steps to diagnose a rough idle in a 2013 Lexus GS350?

To effectively diagnose a rough idle in your 2013 Lexus GS350, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by using an OBD-II scanner to identify any error codes that may indicate specific issues within the engine. This initial step can save time and direct your focus to the most likely culprits. Next, inspect the spark plugs for wear or fouling, as these can significantly impact engine performance. A clean air filter is also crucial; ensure it is free from dirt and debris to maintain optimal airflow. Following this, examine the vacuum hoses for any signs of cracks or disconnections, as leaks can disrupt engine function. Don’t overlook the fuel system; check the fuel filter and injectors for clogs that could hinder performance. Additionally, cleaning the throttle body can help restore proper airflow and improve the air-fuel mixture. Finally, consider performing a smoke test to detect any vacuum leaks in the intake system. By following this structured diagnostic approach, you can efficiently identify and resolve the underlying causes of a rough idle in your vehicle.

What are the common causes of a rough idle in a 2013 Lexus GS350?

When diagnosing a rough idle in your 2013 Lexus GS350, it's essential to consider several common problems that could be at play. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to an uneven idle. Additionally, faulty spark plugs are notorious for causing misfires; if they are worn out, they can disrupt the combustion process and result in a rough idle. Another potential issue is vacuum leaks, which can disturb the air-fuel mixture necessary for smooth engine operation. Fuel system problems, such as clogged fuel filters or injectors, can also hinder performance and contribute to rough idling. Furthermore, a malfunctioning Mass Airflow Sensor (MAF) can throw off the air-fuel balance, exacerbating the issue. Lastly, don't overlook the Exhaust Gas Recirculation (EGR) valve; if it's faulty, it can interfere with combustion and lead to a rough idle. Addressing these issues promptly will help restore optimal performance and ensure a smoother driving experience.

How urgent is it to address the rough idle in a 2013 Lexus GS350?

Addressing a rough idle in your 2013 Lexus GS350 is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. A rough idle can indicate underlying issues such as problems with the fuel system, ignition components, or engine sensors, which, if left unchecked, may escalate into more severe mechanical failures. Ignoring this symptom can lead to decreased fuel efficiency and poor engine performance, ultimately resulting in costly repairs down the line. Moreover, a rough idle can sometimes signal serious problems that could compromise your vehicle's safety and reliability. By prioritizing timely maintenance and repairs, you can prevent further damage and ensure that your Lexus operates smoothly and efficiently, safeguarding both your investment and your driving experience. Therefore, if you notice a rough idle, it is essential to address it promptly to avoid potential complications.